Update the instructions for running the tests

Author: ross-u

README.md

@@ -35,11 +35,15 @@ git push origin master
 
 You will be working in the `src/clue.js` file, which is already loaded in the `index.html` file.
 
-To run the JavaScript code open the `index.html` file using the [Live Server](https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer) VSCode extension.
+To run the JavaScript code, open the `index.html` file using the [Live Server](https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer) VSCode extension.
 
-To see output of your JavaScript code open the [Console in the Developer Tools](https://developer.chrome.com/docs/devtools/open/#console).
+To see the output of your JavaScript code, open the [Console in the Developer Tools](https://developer.chrome.com/docs/devtools/open/#console).
 
+### Note about tests
 
+This LAB is equipped with unit tests to provide automated feedback on your lab progress.
+
+**After completing the basic iterations**, go to the **"Test Your Code"** section at the bottom. There you'll be asked to install the testing dependencies and run the tests to check how many tests your code is passing. Once you run the tests, correct your code to pass the failing tests.
 
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